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It is particularly prevalent in the broadcasting of sports events, although other television or radio programs may be blacked out as well. Most blackout policies serve to protect local broadcasters (primarily regional sports networks) from competition by "out-of-market" networks that carry different teams, by only allowing viewers to watch non-national telecasts of teams within their designated markets (with television providers blacking out regional telecasts of teams that are outside of their market; in turn, encouraging viewers to purchase subscription-based out-of-market sports packages), and by allowing teams to black out national telecasts of games that are also being shown by a local broadcaster. By contrast, the blackout policies of the National Football League serve to encourage attendance to games instead—by only allowing them to be broadcast on television in a team's designated market if a certain percentage of their tickets are sold prior to the game.

Perhaps the most notable non-sports-related blackout in television is the blackout of Canadian federal election coverage. Because there are six time zones across Canada, polls close in different parts of the country at different times. Section 329 of the Canada Elections Act outlaws publishing election results from other ridings in constituencies where polls were still open, ostensibly to prevent the results from the East from influencing voters in western ridings.

Before the 2000 election, Elections Canada moved to reduce the effects of the blackout and the influence of unauthorized knowledge of election results in Western ridings by altering the times that polls close so that polls no longer close at the same local time throughout the country. Polls in Atlantic Canada now close at 9 p.m. Atlantic (9:30 in Newfoundland). Polls from Alberta to Quebec close an hour later (9 p.m. Eastern, 8 p.m. Central and 7 p.m. Mountain) and finally, polls in British Columbia close an hour after that (7 p.m. Pacific). Historically, the results of the election are often not decisively known until more than an hour after polls close in Ontario and Quebec, but are usually known within two hours of these polls closing.

Provincial elections are not subject to blackout restrictions – in provinces that have two time zones, the vast majority of the population lives in one time zone or the other. Election laws in these provinces stipulate that all polls are to close at the same time – this time invariably being 8:00 p.m. (or 9:00 p.m. in Ontario beginning with the 2007 provincial election) in the time zone of the majority.

On August 17, 2011, Elections Canada Chief Electoral Officer Marc Mayrand suggested to Parliament that the current voting system needs to be improved, the improvements including a repeal on the ban of early election results in areas where polls are still open; this was in light of the expanded use of social media to transmit results outside of radio and television.[2] According to his report, Mayrand says that "the growing use of social media puts in question not only the practical enforceability of the rule, but also its very intelligibility and usefulness in a world where the distinction between private communication and public transmission is quickly eroding. The time has come for Parliament to consider revoking the current rule."[2][3] On January 13, 2012, it was announced that the federal government would introduce legislation that would repeal the blackout rule, citing the increased use of social media as the reason,[4] although as of August 2013, this has yet to be implemented.

As in the U.S., National Hockey League games that are not broadcast by the league's national broadcast partners are televised in English by regional feeds of either Sportsnet or TSN, and are blacked out for viewers outside of the team's home market. Sportsnet's four regional feeds correspond with each of its NHL teams' designated markets; the East, Ontario, and Pacific feeds are designated to one team each (the Montreal Canadiens, Toronto Maple Leafs, and Vancouver Canucks), while Sportsnet West and its corresponding market (which includes all of Alberta and Saskatchewan) is shared by the Edmonton Oilers and Calgary Flames. Although West is also the main feed for Manitoba, Flames and Oilers games are blacked out there to protect the Winnipeg Jets. As of August 2014, TSN is similarly structured, with the Ottawa Senators on TSN5 (East), Maple Leafs on TSN4 (Ontario), and Jets on TSN3 (Manitoba and Saskatchewan). While split between two broadcasters, the Canadiens and Senators share the same market, which includes parts of Eastern Ontario, Quebec, and Atlantic Canada).[5][6]

Until the 2014-15 season, all French-language broadcasts of the Montreal Canadiens were available nationally on RDS, who was also the national French-language rightsholder of the NHL in Canada. As RDS was, until 2011, the only French-language cable sports channel in Canada,[7] the team forwent a separate regional rights deal and allowed all of its games to be broadcast as part of the national package. As of the 2014-15 season, Quebecor Media and TVA Sports is the national French rightsholder as part of a sub-licensing agreement with Rogers Communications.[8][9][10] RDS negotiated a 12-year deal with the team for regional rights to the Canadiens: games are now blacked out for viewers outside of Quebec, Atlantic Canada, and parts of Eastern Ontario.[6][11]

Out-of-market games can be viewed using the subscription-based NHL Centre Ice and Rogers NHL GameCentre Live services, although in-market games are blacked out from both services to protect local broadcasters. Beginning in the 2014-15 season, as Rogers has taken over the service in Canada per the aforementioned rights deal, GameCentre allows streaming of all national telecasts, along with in-market regional telecasts of a viewer's local team if their regional broadcast rights are held by Sportsnet (which excludes the Jets, Senators, and portions of the Maple Leafs, whose rights are owned by TSN, as mentioned).[12]

Major League Baseball and the National Hockey League have very similar blackout rules. Unlike the National Football League, the blackout of games has nothing to do with attendance, but instead is implemented to protect broadcasters with contracts to air games. Unless a national broadcaster such as ESPN has exclusive rights to a certain regular season game (as they do on Sunday nights), the local broadcaster of a game (such as a Fox Sports regional network for example) has priority over a national broadcaster—so if Fox Sports 1, MLB Network, or TBS is airing a game that is also being aired by the local broadcaster, the national feed would be blacked out in markets where a local broadcaster is also showing coverage unless the national network simulcasts the regional feed. .[13][14]

As of the 2014 MLB season, ESPN's coverage of Monday and Wednesday night games is allowed to co-exist with that of a regional broadcaster, and thus no longer has to be blacked out in the participating teams' markets.[15]

In the NHL, the policy has changed in recent years. Now, most national cable games are shown throughout the country. Occasionally, the league will grant its cable partner an exclusive window and not schedule any other games involving U.S. teams at that time. For NBC's network coverage in the 2006–2007 season, only games it televised could air during its window, airing different games by region. The coverage was changed in the 2007–2008 season to a Game of the Week format.

If a regional sports network owns the rights to two NHL teams that are competing in the same game, the NHL will allow the channel to use SAP to carry commentary from both teams throughout both teams' coverage areas on the same channel. This most commonly happens with MSG Network, which owns the broadcast rights to four NHL teams from fairly disparate areas: New Jersey's New Jersey Devils, Long Island's New York Islanders, New York City's New York Rangers, and Buffalo's Buffalo Sabres (although the Sabres control the entire production of their broadcast through the Sabres Hockey Network, while MSG produces the other three broadcasts). For instance, though MSG will only produce one pregame and postgame show for a game between the Islanders and Sabres, they will carry the Sabres Hockey Network on the main audio feed in upstate New York and the Islanders' commentators on SAP; however, in New York City and Long Island, viewers hear the Islanders broadcasters on the main feed and the Sabres commentators on SAP.

Additionally in the NHL, local and regional networks are not granted broadcast rights for national televised games by Comcast's NBC broadcast network or cable channel NBC Sports Network, or during the playoffs, any Comcast channel showing an NHL playoff game. A recent controversy arose in 2009 when satellite provider DirecTV stopped offering NBCSN predecessor Versus following a dispute with Versus owner and competitor Comcast.

In Major League Baseball, there are no radio blackouts. However, for many years, the radio networks of the two participating ballclubs in the World Series were not allowed to air games, forcing flagship stations, if they wanted to broadcast the Series, to simulcast the network broadcast.

This changed after 1980, fans of the Philadelphia Phillies were angry that they could not hear their popular broadcasting team of Harry Kalas and Richie Ashburn call the team's run to the title. Since then, only the flagship stations of the two participating ballclubs can originate coverage, though their broadcasts are also available on XM Satellite Radio. XM is required to broadcast the home, away, and both English and Spanish national feeds of the World Series. All other network affiliates of the two clubs must carry the feed from MLB's national partner (currently ESPN Radio), and they may not even be able to do so if they compete with an ESPN Radio affiliate in the same market.

Additionally, radio stations (including flagships) may not include MLB games in the live Internetstreams of their station programming. MLB itself offers radio feeds as a pay service via the league and team websites. Some stations will simply stream the station's regularly scheduled programming that is being preempted by the game.

The NHL has neither radio blackouts nor national terrestrial coverage. All games are streamed online and home game feeds are broadcast on XM.

Prior to the 1998-99 NBA lockout, the NBA and the WNBA used to black out nationally televised games on cable television within 35 miles (56 km) of the home team's market; however, these are now restricted to games on NBA TV.

In the NFL, any broadcaster that has a signal that hits any area within a 75 miles (121 km) radius of an NFL stadium may only broadcast a game if that game is a road game (also known as an away game), or if the game sells out 72 hours or more before the start time for the game.[16][17] If sold out in less than 72 hours, or is close to being sold out by the deadline, the team can sometimes request a time extension. Furthermore, broadcasters with NFL contracts are required to show their markets' road games, even if the secondary markets have substantial fanbases for other teams (like in Harrisburg, Pennsylvania, officially a Baltimore Ravens secondary market, but home to many Pittsburgh Steelers fans). Sometimes if a game is within a few hundred tickets of selling out, a broadcaster with rights to show the nearly sold out game will buy the remaining tickets (and give them to local charities) so it can broadcast the game. Other teams elect to close off sections of their stadium, but cannot sell these tickets for any game that season if they choose to do so.[18] As a result, if the home team's game is a Sunday day game, both networks can air only one game each in that market (until 2001, this rule applied whether or not the game was blacked out, however, this was changed because some markets virtually never aired doubleheaders as a result). Usually, but not always, when each network can show only one game each in a market, the two stations work out between themselves which will show an early game and which will show a late game. This only affects the primary market, and not markets in a 75-mile (121 km) radius, which always get a doubleheader each Sunday.

There are two exceptions to the rule. The first is for the Green Bay Packers, which have two overlapping 75-mile blackout zones – one surrounding the team's stadium in Green Bay and another surrounding Milwaukee. The team's radio flagship station is in Milwaukee, and the Packers played part of their home schedule in Milwaukee from 1953 through 1994. However, this policy has never been implemented in the Packers' case, as they have sold out every home game in Green Bay since 1960 and have a decades-long season-ticket waiting list (games in Milwaukee also sold out during this period). The second exception is for the Bills Toronto Series; by a technicality, Rogers Communications (the team's lessee) owns all tickets to those games and resells them to potential fans. Thus, even if the games do not sell out, it is still technically a sellout (since Rogers is said to have bought the tickets) and the games are televised. This rule has come into play for both Toronto Series preseason games.[19][20]

The NFL blackout is considered to be detrimental to financially struggling teams. For instance, most notably, the Los Angeles Rams were unable to sell-out their home games during their last years in that city (a notable exception being the 1994 game against then-crosstown rivals the Raiders). So a blackout further robbed the franchise of potential revenue and alienated remaining fans. The Rams relocated to St. Louis before the 1995 season (the Raiders also left L.A., going back to their original home in Oakland).

For other games, no station within the 75-mile (121 km) radius of an NFL stadium may broadcast a game unless it has an affiliation deal with one of the local teams involved. One instance of the practice of this rule was over Hartford, ConnecticutCBS affiliate WFSB trying to air a New England Patriots-New York Giants game for December 29, 2007, which would be carried only on the NFL's cable network NFL Network that at the time was available only on a sports tier of cable provider Comcast in the immediate viewing areas of the Patriots and Giants.[21]

On December 12, 2007, Broadcasting & Cable reported that Senator John Kerry and Rep. Ed Markey, both of the state of Massachusetts and fans of the New England Patriots team, wrote to the NFL as well as Comcast and Time Warner Cable to request that the Patriots-Giants game be aired at least on basic cable in order to reach the highest possible number of television-viewing fans, as at the time the Patriots were undefeated, and Kerry and Markey viewed the game as "potentially historic", according to John Eggerton of B&C.[22] Kerry clarified the next week that he did not intend to interrupt current negotiations between the cable operators and NFL.[23] On December 19, 2007, representative Joe Courtney (D-CT) and other members of the Connecticut Congressional Delegation wrote to NFL commissioner Roger Goodell to try to have the NFL allow wider broadcast access to the game.[21] Consequently, on December 26, the NFL approved the game to be simulcast from NFL Network to both the CBS and NBC networks, along with WCVB-TV in the Boston market and WWOR-TV in the New York City market.[24]

In June 2012, NFL blackout regulations were revised in which, for the first time in NFL history, home games will no longer require a total sellout to be televised locally; instead, teams will be allowed to set a benchmark anywhere from 85 to 100 percent of the stadium's non-premium seats. Any seats sold beyond that benchmark will be subject to heavier revenue sharing.[25] However, four teams, the Buffalo Bills, the Cleveland Browns, the Indianapolis Colts and the San Diego Chargers, have opted out of the new rules, as it would require the teams to pay a higher percentage of gate fees to the NFL's revenue fund.[26]

Per NFL policies, all games that are exclusively televised on cable, including ESPN's Monday Night Football and Thursday Night Football games that are only shown on NFL Network, are syndicated to over-the-air broadcasters in the markets of the teams involved. To protect these local broadcasts, the national feeds of these games are blacked out.

For radio broadcasts, the NFL follows a nearly identical policy to MLB. There are no radio blackouts, but only each team's flagship station can carry local broadcasts during the conference championships or Super Bowl. All other markets must carry the NFL on Westwood One feed for those games. For all other weeks, within 75 miles of a team's stadium, only stations the team or its flagship station contracts with can carry those games, regardless if the team is home or away. Thus, any competing station that carries Westwood One broadcasts cannot air those games. Like MLB, the NFL makes local broadcasts (except for those of the Tennessee Titans) available on FieldPass and Sirius Satellite Radio; as a result, radio stations that carry NFL games, from any source, and stream on the Internet are prohibited from streaming games online, although it seems this provision is loosely enforced in some cases; WBBM in Chicago regularly airs live broadcasts of Chicago Bears games over their Internet stream.

MLS Direct Kick contains MLS games originating from either a regional sports network (RSN) or a local over-the-air station and delivers these games to customers who purchase this subscription. These games are not otherwise available to DirecTV subscribers because they are broadcast outside of a subscriber's local area. Further, MLS games shown nationally on ESPN, ESPN2, UniMás and FOX are not included as part of this sports subscription.

The Indianapolis 500 is blacked out in the Indianapolis area on television in order to encourage race attendance, thus WRTV, the ABC affiliate in Indianapolis, carries the race tape-delayed in primetime instead. The radio broadcast can still be heard on the Indianapolis Motor Speedway Radio Network, and some fringe parts of the market can watch the race via affiliates in Fort Wayne (WPTA), Terre Haute (WAWV-TV), Dayton, Ohio (WKEF), and Louisville, Kentucky (WHAS-TV). In the early years of the Brickyard 400, that event was also blacked out locally as the track's television contract between IMS and ABC applied for both races. Since 2001, when the association adopted a centralized broadcast rights scheme, television rights to the race have been controlled by NASCAR proper, and the Brickyard 400 is not blacked out.